Behavior of atmospheric CO2 during abrupt climate change
Jinho Ahn, Seoul National University
The relationship between climate and the greenhouse gas remains incompletely understood. For example, the predicted magnitude of additional CO2 rise by climate-carbon cycle feedbacks is model-dependent. In this context, construction of precise and continuous ancient atmospheric greenhouse gas records is essential to improve our understanding of climate change. Ancient air trapped in Ant- arctic ice provides a unique archive that provides the best record of ancient atmospheric greenhouse gas concentrations and extends to the last 800 thousand years. In particular, atmospheric CO2 records during abrupt climate events are invaluable data for testing carbon cycle models under variety of boundary conditions. Recent high-resolution ice core records reveal that atmospheric CO2 did not change under relatively weak abrupt climate perturbations on millennial to centennial timescales. This is in contrast with that small variations of CO2 were in harmony with climate during gradual climate changes. Proxy records for ancient climate and environment mayhelphow the atmospheric CO2 was controlled by exchange of carbon in land and ocean.